Stitch remover



April- 12, 1927.-

L. SCHILDKNECHT STITCH REMOVER Filed July 17. 1925 9 H7- TO//VEYS 'Patented Apr. 12, 1927.

warren snares,

PATENT OFFICE.

LEO SGHILDKNECHT, OF ST. LOUIS, MISSOURI, ASSIGNOR TO LANDIS MACHINE COM- PANY, OF ST. LOUIS, MISSOURI, A CORPORATION OF MISSOURI.

STITCH REMOVER.

Application filed July 17, 1925. Serial No. 44,293.

My invention relates to shoe repair machinery and consists in an improved device for removing stitches from a shoe welt which may be connected by the stitches to suitable partsof a shoe such as an upper, an insole or both.

hen. a shoe is to be half-soled, a knife is inserted between the outer sole and the inner sole or welt, and the legs of the stitches cut intermediate their ends. After this cutting operation andeither before or after the old outer sole is removed, the shoe may be applied to my in'iproved device to remove the upper portions of the stitches.

The objects of my invention are to provide an eli'ective tool for the purpose described; to provide a tool which may be more easily manufactured and may be manufactured of more Suitable material than has been used heretofore; to provide a tool, the teeth of which may be repeatedly rcsharpened when dull; and to provide a tool,

in which the effective depth of the teeth may be varied at will.

In the acci'nnpanying drawings which il lust-rate a selected embodin ient of my invention,

Figure 1 is in part a side view and in part a vertical longitudinal section of my improved stitch remover mounted upon a shaft and showing the application of a shoe there- Figure 2 is an end elevation of the tool viewed from the righthand side of Figure 1 and showing the shaft in transverse section.

Figure 3 is a detail view showing a variation in the adjustment of the tooth element and the guard element.

The shaft 1 is the ordinary shaft provided on the operating table used by shoe repairers to carry and rotate brushes, sanders, and similar devices. lidable on shaft 1 is a sleeve 2 comprisingthe body of my device and adapted to be secured in position on the shaft by means of set screws 3. Slceve 2 is shouldered at 4t and a thin circular disk 5 preferably made of sheet steel is securedto shoulder i by screws 6, Disk 5 has a smooth and unbroken periphery 7 and is provided with a series of perforations 8 space-d a short distance from its periphery.

Mounted on the sleeve 2 is a collar 9 removably secured to the sleeve by set screws 10. Bemovably secured to the end of collar 9 by screws 11 is a ring 12 which is provided with a series of annular teeth 13 so shaped and positioned relatively to the perforations 8 in disk 5 that when the two parts are assembled as shown in the drawings, teeth 13 project through perforations 8 to a greater or less extent according to the positioning of collar 9 on sleeve 2.

A shoe may be applied to the assembled tool as indicated at A in Figure 1. The

smooth periphery of disk 5 affords a guardbe ground on an ordinary grinding wheel and the deepest and sharpest portion of the tooth may be at its outer end and this end may extend abruptly from the annular surface of disk When the teeth are dulled, collar 9 and ring 11 are easily removed from the remainder of the tool, and, if necessary, from each other, so that the teeth may be reground on the faces 141 and 15, the intersection of which faces forms the working edges of the teeth, these edges being disposed in a plane extending radially of the tool.

By making the teeth of substantial depth, they may be repeatedly reground without reducing their effective depth when assenr bled with disk 5 as the longitudinal adjustment of body 2 and sleeve 9 provides for such movement of the disk toward the base i of the teeth that the portion of the teeth projecting beyond the disk may be maintained notwithstanding substantial wear on the working edges of the teeth.

I am aware that it has been previously proposed to provide annular teeth on disks having a smooth periphery but as far as I am aware, it has been the previous practice to stamp the teeth in sheet steel disks which rendered it impossible to provide the highest point of the tooth at its outer end, due to the fact that the stamping and subsequent hardening operations have a marked tendency to crack the disk from the tooth to its periphery. Of course, it has been impossible to stamp such teeth from tool steel and it has been CllfiiGLllt, if not impossible, to sharpen teeth formed by the stamping operation. The stamping of annular teeth as described does not provide in any way for adjustment of the depth of the teeth, nor does it provide any means whereby the teeth, if they could be resharpened, could have their original depth maintained as is possible with my tool. In Figure 3 I illustrate the movementof the tooth element up against the face of disk 5 which would result in the original teeth being projected through the perfora tions 8 a greater distance than shown in Fig ure 1 or would result in teeth worn down by use and regrinding being projected through the perforations to the same distance as shown in Figure 1.

Obviously, various modifications in the details of my invention may be made without departing from the spirit thereof, and 1 contemplate the exclusive use of such modifications as fall within the scope of my claims.

I claim:

1. A rotating switch removing tool comprising a member having a plurality of teeth integrally formed on one face and arranged in a circle thereon, and a separately formed perforated disk having a smooth work supporting edge and secured to said member with the teeth of said member projecting through the perforations in said disk.

2. A rotating stitch removing tool comprising a member having a )lurality of teeth integrally formed on one annular face and arranged in a circle and a separately formed perforated disk having a smooth work supporting edge, and means detachably securing said member and disk in assembled position with the teeth of said member projecting through the perforations in said disk.

3. A stitch removing tool comprising a rotatable member, a series of teeth thereon, a disk having an unbroken work supporting periphery and a series of perforations spaced therefrom and receiving said teeth, and means for securing said member and disk in different relative positions to vary the extent of projection of said teeth through said perforations.

t. A stitch ren-ioving tool comprising a rotatable shaft, a member rotatable there with, a series of teeth on said member, and

a disk held in a predetermined position relative to said member and having an unbroken periphery adapted to engage a shoe being operated upon, there being a series of perforations in said disk spaced from said periphery and receiving said teeth.

5. A stitch removing tool comprising a rotatable member, a series of teeth integral therewith, with cutting edges spaced axially from the body of said member, and means adjustable axially of said member for varying the effective depth of said teeth to control the extent to which they may cut into the article applied thereto.

'6. A stitch removing tool comprising a rotatable member, teeth on said member having cutting edges spaced from the body of said member in the same general direction as the axis of rotation of said member, and a perforated disk rotatable with said memher and adjustable axially of the latter to fit over said teeth and determine the efi ective depth of all of said teeth to control the extent to which they may cut into the article applied thereto.

T. It tool for removing stitches from a shoe welt con'iprising a rotatable member having a surf-are extending transversely of it; 's of rotation, a series of teeth projecting from said surface far enough to permit repeated regrinding of their working edges, and adjustable means for maintaining a desired effective depth of said teeth in contacting with a shoe welt irrespective of the depth of said teeth due to regrinding.

8. A tool for removing .stitches from a shoe welt comprising a one-piece rotatable member having a smooth face extending transversely of its axis of rotation and bounded by a smooth exterior periphery adapted to engage a portion of the shoe being operated upon to space such portion from the remainder of the tool, and a series of integral teeth projecting from said face, the outer end of each of said teelh extending from said face substantially at right angles thereto and spaced a short distance from said periphery.

In testimony whereof I hereunto afl ix my signature this 2nd day of July, 1925.

LEO SGHILDKNECHT. 

